The Brain: a small, three-pound chunk of flesh that essentially controls our body, but the way it functions is far more complicated. The brain is the most complex item within the known universe. Chapter 3 goes in depth about the biology of the brain. It describes the individual parts of the brain and it explains each piece's function.
So you might be asking yourself, "What makes this thing in my head so complex?" The brain's most basic component is its cells. Within each cell there are many different parts such as neurons and dendrites. Neurons are what allow our brain to communicate; there are 100 billion neurons within each brain! Neurons use electrical transmissions to send messages throughout the body.
A popular myth is that we use only 10% of our brain. We actually use most, if not all of our brain capacity at all times. Each part of our brain has different functions. A simple map within this chapter shows six parts, each with a different function. For example, the brain stem regulates involuntary functions such as your heart rate and breathing. The largest part of the brain is the Cerebral Cortex, which is split into two hemispheres that are connected by the Corpus Callosum.
Our brain is a very complicated computer-like system; it is amazing that such a powerful tool is within our heads!